/Engine/Source/Runtime/MeshDescription/Public/MeshDescription.h
Populates the passed array with adjacent triangles
template<typename Alloc> void GetTriangleAdjacentTriangles ( const [FTriangleID](API\Runtime\MeshDescription\FTriangleID) TriangleID, [TArray](API\Runtime\Core\Containers\TArray)< [FTriangleID](API\Runtime\MeshDescription\FTriangleID), Alloc > & OutTriangleIDs ) const